I think its a neat idea. No idea however to contain the vapors or choose a suitable tube that wont bond or a metal.

the heat capacity of mercury is terrible compared to water and some additive. the heat transfer obviously is amazingly good. I would assume the flow rate would have to be super high to pull heat off compared to water cooling.

Side note: people worry too much about flow rate in WC'ing. it really is a matter of size of radiator moreso.

There was a cooler that came out a few years ago that used mercury in the place of heatpipes and water. It had pretty good performance, but it cost upwards of $300 I think. Ah, here it is.

I guess if you made the entire thing like a water setup, then it may have better performance, but as everybody said mercury is extremely toxic. Also, your bottleneck would still be fan noise on the radiator. There are some pretty quiet water pumps out there...

Yeah, with mercury being toxic, this wouldn't be such a great idea. I wonder if gallium would work, or galinstan. Gallium melts around 30C, so you'd have to make sure that your system kept it warm, galinstan is an alloy that freezes at -19C, so it would be liquid even at lower room temperatures. I guess the big question is whether or not gallium or galinstan would conduct enough to be useful in a pump. Interesting idea.

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